Many times in schools, colleges & offices surfing some sites are banned.

To overcome this you can unblock these or block some other websites and play pranks !

Follow the Instructions Below To Block a Website:

Open the folder C:\WINDOWS\system32\drivers\etc

There you will find a file named HOSTS

Click on the file and right click.

From the right click menu select Open with.

Now, select Notepad to open the file from the list.

Now, in the file under the line 127.0.0.1 localhost add another line as 127.0.0.2 http://www.facebook.com.

File > Save.

Follow the Instructions Below To UnBlock a Website:

-> Do Same as above upto and then,Now, open your web browser and try opening http://www.facebook.com, it will not load.To unblock sites just do the opposite. ( means to remove : 127.0.0.2 http://www.facebook.com. )